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Sharma V.,Government Mahila Engg College | Sharma B.,University of Rajasthan | Sharma K.B.,P.A. College | Bhatnagar D.,University of Rajasthan
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

A new design of a single-feed truncated elliptical patch antenna with and without slots for broadband performance with stacked arrangement is proposed in this paper and its performance is tested in free space. This multilayered rectangular microstrip antenna is designed and analyzed by using the ie3d simulation software. In between conducting and ground plane, designed antenna has two glass epoxy fr-4 substrates separated by an air substrate to attain broadband performance. The impedance bandwidth of designed antenna is better than 2.11GHz or 60% with respect to the central frequency. The simulated e plane co and cross radiation patterns are identical in shape for most of the part of bandwidth however at higher frequency side due to the presence of higher modes and cross polarization the radiation pattern are no more directive normal to patch geometry. Copyright © 2013 SPIE. Source


Sharma V.,Government Mahila Engg College | Saxena V.K.,University of Rajasthan | Sharma K.B.,P.A. College | Bhatnagar D.,University of Rajasthan
Romanian Journal of Information Science and Technology | Year: 2011

The paper presents design and radiation performance of an elliptical patch antenna with three orthogonal sector slots and its performance is compared with that of a conventional elliptical microstrip patch antenna (EMPA) operating under similar test conditions. The proposed elliptical microstrip patch antenna has two sector slots along the major axes aligned opposite to each other and a sector slot orthogonal to these two slots and aligned along the minor axis. The location and dimensions of these sector slots are optimized to obtain improved bandwidth close to 10.96% which is nearly four times higher than that of a conventional EMPA tested under identical test conditions. The gain of antenna is marginally improved still it needs further improvement. The measured E and H plane co and cross polar patterns of modified antenna are also present for better understanding. The modified antenna meets the bandwidth requirements for the IEEE 802.11 a5 wireless local area network (WLAN) applications. Source


Sharma V.,Government Mahila Engg College | Sharma K.B.,P.A. College | Saxena V.K.,University of Rajasthan | Bhatnagar D.,University of Rajasthan
Frequenz | Year: 2012

In this communication design and performance of a novel single-layer assembly of gap coupled elements in elliptical shape is proposed to achieve broadband performance with circular polarization. Out of five patches considered in this assembly, two pairs of patches having different patch areas are arranged close to an edge truncated elliptical patch. The central edge truncated elliptical patch is fed through inset feed arrangement and the other patches are parasitically gap coupled to the central patch. With such an arrangement, an improved impedance bandwidth of 1.58 GHz or 18.5% with respect to central frequency 8.5 GHz is achieved. Three resonant modes are excited with this arrangement giving improved bandwidth and gain in comparison to a conventional elliptical patch antenna with same semi-major and semi-minor axes. In the entire bandwidth, the simulated radiation patterns of proposed arrangement of patches are more or less identical in shape. Copyright © 2012 De Gruyter. Source


Sharma V.,Government Mahila Engg College | Sharma M.M.,Government Engg College
Radioengineering | Year: 2014

A dual band circularly polarized single-feed microstrip antenna for wireless communication systems is proposed here and its performance is tested in free space. This modified rectangular microstrip antenna having one protruded curved edge is simulated by using the IE3D simulation software. In between conducting patch and ground plane, designed antenna has two layers of glass epoxy FR-4 substrates separated by a thin layer of foam substrate. This designed antenna operates at two frequencies 3.10 GHz and 3.55 GHz and presents circularly polarized performance in far-field region. The measured impedance bandwidth of designed antenna is 26% (0.846 GHz) with respect to the central frequency 3.31 GHz. The axial ratio bandwidth at two frequencies 3.10 GHz and 3.55 GHz is close to 1.36% & 2.21% respectively. The measured E plane co and cross radiation patterns in entire impedance bandwidth are identical in shape and direction of maximum radiations is normal to patch geometry as the losses in cavity reduce as the quality factor of the cavity is decreased. Source


Sharma V.,Government Mahila Engg College | Sharma M.M.,Government Engineering College
Frequenz | Year: 2014

This paper presents a wideband gap coupled assembly of rectangular microstrip patches applicable in lower and upper band of Wi-Max applications utilizing six directly and parasitically coupled patches. Considered assembly of patches on glass epoxy FR4 substrate has overall dimension of 40.0 mm by 52.88 mm. The proposed antenna is designed to function in the lower band (2.4- 2.69 GHz) and upper band (5.25-5.85 GHz) of Wi-Max systems. The antenna is simulated using IE3D simulation software in view of the Wi-Max standards adopted by IEEE 802.16 working group. The simulated and measured results are well in agreement and show that antenna resonates in two bands proposed for wireless communication applications and successfully achieves the bandwidth of 11.2% (at VSWR: 1.5) with respect to the center frequency of 2.84 GHz in lower band and 9.7% with respect to the center frequency of 5.39 GHz in upper band. Gain and efficiency of antenna in these two bands are however low due to lossy substrate but radiation patterns in each of these two bands are identical in shape in entire bandwidth region. In lower band maximum radiations may be achieved normal to patch geometry but in upper band, direction of maximum radiations is inclined at θ = 60° perhaps due to the generation of higher mode. Source

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